Khushal/Sailee: Changed the path of migration folder in flyway related t...

Changed the filesystem path in migration task so that they run on jenkins.
To run the migration task now one will have to run in from one level above and like this:
gradle migrateTenantListDB -PdbName=mifosplatform-tenants -b mifosng-provider/build.gradle

gradle migrateTenantDB -PdbName=mifostenant-default -b mifosng-provider/build.gradle